The good folks at the CCEL have provided an edition of the works of Dionysius the Areopagite in English. I know little about Dionysius, and even less about the available editions. The edition at CCEL is the 1897 edition of John Parker. As usual, several formats are available.

Searching for images of Dionysius led me to the new-to-me Orthodox Wiki. You can read the Orthodox take on Dionysius, complete with an image of him (the check pattern on his garment is interesting to me) in teaching position (note right hand).